In order to improve the methane storage in porous media under mild conditions, the storage characteristics of methane in Mil⁃101 (Cr) were studied based on adsorption water method.MIL⁃101 (Cr) was prepared and characterized. Methane adsorption experiments were performed at 271.15 K and 0～7.0 MPa with different water contents. The particle size of the synthesized material was uniform, grain size range was 100～150 nm, and almost without impurities. The pore size was mainly distributed in the range of 1.7 nm to 3.6 nm. The results of adsorption experiments show that: MIL⁃101 (Cr) adsorbs more methane under the condition of water, and with the increase of the water content, the amount of methane adsorption increases. The pressure required for nucleation in porous media is higher than that for bulk system, and the greater the water content is, the higher the critical pressure is. The MOF material used in the experiment still has good adsorption capacity after repeated regeneration. The research results have certain significance for increasing the natural gas storage capacity.

The application of M⁃MOF⁃74 series in CO ₂ removal of natural gas was studied. The skeleton model of M⁃MOF⁃74 was established. The adsorption of pure CO ₂ gas and CO ₂/CH ₄ mixed gas in M⁃MOF⁃74 series adsorbent was calculated by GCMC method. The results showed that the order of adsorption of CO ₂ by M⁃MOF⁃74 adsorbent was Mg⁃MOF⁃74 > Ni⁃MOF⁃74 > Co⁃MOF⁃74 > Fe⁃MOF⁃74 > Cr⁃MOF⁃74 > Mn⁃MOF⁃74.When adsorbing mixed gases, the adsorption amount of CO ₂ by each adsorbent is consistent with that of pure CO2 adsorption, and the adsorption amount of CH ₄ is: Mg⁃MOF⁃74>Ni⁃MOF⁃74≈Co⁃MOF⁃74≈Fe⁃MOF⁃74≈Cr⁃MOF⁃74≈Mn⁃MOF⁃74. The law of isosteric heat of gas on M⁃MOF⁃74 is the same as that of adsorption capacity, indicating that the interaction between gas and M⁃MOF⁃74 is the main factor affecting the adsorption amount. The selectivity of each adsorbent to mixed gas: Ni⁃MOF⁃74>Co⁃MOF⁃74>Fe⁃MOF⁃74>Mn⁃MOF⁃74>Cr⁃MOF⁃74>Mg⁃MOF⁃74. Comprehensive comparison of CO ₂ adsorption capacity, regeneration energy consumption, selectivity coefficient and other parameters, Ni⁃MOF⁃74 is more suitable for the adsorption and separation of CO ₂ in natural gas.

Because of geological disasters, corrosion defects, third party damage and other factors, there are many hidden dangers in the safe transportation of oil and gas pipelines. Therefore, it is of great practical significance to study the law of leakage and diffusion of buried natural gas pipelines for the prediction and location of leakage points and the formulation of emergency plans.Numerical analysis of the leakage and diffusion process of buried natural gas pipeline is carried out, the influence of leakage velocity, wind speed and environmental temperature on CH4 the methane concentration are analyzed and summed up diffusion law.The research results can provide theoretical support for the accurate location and emergency plan of the buried gas pipeline leakage point.